[llvm-dev] Serializing LLVM IR in custom fashion (original) (raw)

Gleb Popov via llvm-dev llvm-dev at lists.llvm.org
Thu Sep 6 06:40:58 PDT 2018

Hello.

I need to write a pass that converts a whole LLVM module into a bytecode for some other VM. VM's instructions resemble LLVM ones pretty much, so it is almost 1-to-1 translation. Basically, I need to do what BitWriterPass does, but using different format for the resulting bytecode.

The obvious solution is just to iterate over all Instructions and serialize them using giant switch(i->getOpcode()), however this involves writing much boilerplate code. And I would eventually need to write a deserializer too, so that doubles the boilerplate work.

Any ideas how to do that easier way? How much of existing LLVM code can I reuse?

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